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Old 04-04-2018, 05:52 PM   #1
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2010 Damon Tuscany black water tank flush connection

Hello. The flush connection, located in the water compartment wall, for the black water tank has an issue I have not been able to correct. Used to be that when I connected a water hose from an outdoor water spigot the water would flow right into the black water tank, and if I had the black water tank drain valve open, the water would then flow thru the tank and out the drain valve. Now, the water does not flow thru -- I cannot hear it flow nor see anything coming out the drain. I pulled off the connector at the wall to see if it might be plugged, but it is ok and all I can see there is that it connects to another hose that loops upwards into the floor of the bathroom directly above. I cannot see where this hose is routed nor if there might be some kind of check-valve in the line. In the bathroom above I checked under the sink but do not find anything for the flush line. In the bathroom along the side wall there is a box mounted onto the floor and the wall the length of the room and it has a carpet cover - I am assuming there are water lines, electric cables and maybe heater ductwork inside that box area -- but cannot find a way to remove the cover or the box - any ideas or suggestions? Thanks
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Old 04-04-2018, 06:53 PM   #2
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Black tank flush system has an 'anti-siphon vacuum breaker backflow preventer' at the top of that line that comes from the hose connection.

Then a line comes out the side of that 'device' and goes down to the spray nozzle that is installed in sidewall of black tank

Either the 'device ' is bad OR more likely is the nozzle is clogged

The device looks something like this:
Can be black plastic, white/clear plastic or brass
And are typically in cabinet under bathroom sink







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Old 04-04-2018, 09:45 PM   #3
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WOW! What great information! And the pictures really help as well. I did look in the cabinet but do not recall seeing the backflow prevention device there, thus was think might be in that carpet-covered box along the floor area next to the sidewall. But I will look at the area again carefully tomorrow in the daylight. Will post what I find. Thank you very much!!
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Old 04-05-2018, 05:23 PM   #4
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Thank you, Old Biscuit!! That is exactly what I have under the counter in the bathroom. I'll take it off, check it out, and either replace it or put it back on, in which case I will have to go back to the outside cabinet, remove some more covers, and see if I can find the actual spray unit mounted on the tank. Thanks again!!
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Old 04-05-2018, 06:34 PM   #5
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Quote:
Originally Posted by 1profesor View Post
Thank you, Old Biscuit!! That is exactly what I have under the counter in the bathroom. I'll take it off, check it out, and either replace it or put it back on, in which case I will have to go back to the outside cabinet, remove some more covers, and see if I can find the actual spray unit mounted on the tank. Thanks again!!
Water flow comes in Bottom connection and flows out side connection to tank nozzle
Internal disc lifts up and seals off open top so water flows thru.
Then when water is secured the disc drops down and allows air into device/downstream line to prevent backflow/siphoning action
More common issue is disc NOT sealing and water running out openings in top....inside RV

Nozzle.....holes can clog up with minerals (hard water) or 'stuff'

Good luck!
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